1,215 research outputs found
On first looking into Brébeuf's Lucan
Georges de Brébeuf not only translated Lucan's Pharsalia in rhyming alexandrines but also produced a travesty of the same work. This unique situation can be understood as a complicated response to the aesthetic provocation offered by the Latin poem. Translation and travesty form a hybrid whole. It is argued that our encounter with Brébeuf’s contradictory poet can help us to better grasp what kind of writer Lucan is: one who grotesquely undercuts his own sublime aspirations
An introduction to Mandelbrot cascades
In this course, we propose an elementary and self-contained introduction to
canonical Mandelbrot random cascades. The multiplicative construction is
explained and the necessary and sufficient condition of non-degeneracy is
proved. Then, we discuss the problem of the existence of moments and the link
with nondegeneracy. We also calculate the almost sure dimension of the
measures. Finally, we give an outline on multifractal analysis of Mandelbrot
cascades. This course was delivered in september 2013 during a meeting of the
"Multifractal Analysis GDR" (GDR no 3475 of the french CNRS).Comment: 36 page
On measures driven by Markov chains
We study measures on which are driven by a finite Markov chain and
which generalize the famous Bernoulli products. We propose a hands-on approach
to determine the structure function and to prove that the multifractal
formalism is satisfied. Formulas for the dimension of the measures and for the
Hausdorff dimension of their supports are also provided
Rayleigh-Benard stability and the validity of quasi-Boussinesq or quasi-anelastic liquid approximations
The linear stability threshold of the Rayleigh-Benard configuration is
analyzed with compressible effects taken into account. It is assumed that the
fluid obeys a Newtonian rheology and Fourier's law of thermal transport with
constant, uniform (dynamic) viscosity and thermal conductivity in a uniform
gravity field. Top and bottom boundaries are maintained at different constant
temperatures and we consider here boundary conditions of zero tangential stress
and impermeable walls. Under these conditions, and with the Boussinesq
approximation, Rayleigh (1916) first obtained analytically the critical value
27pi^4/4 for a dimensionless parameter, now known as the Rayleigh number, at
the onset of convection. This manuscript describes the changes of the critical
Rayleigh number due to the compressibility of the fluid, measured by the
dimensionless dissipation parameter D and due to a finite temperature
difference between the hot and cold boundaries, measured by a dimensionless
temperature gradient a. Different equations of state are examined: ideal gas
equation, Murnaghan's model and a generic equation of state, which can
represent any possible equation of state. We also consider two variations of
this stability analysis. In a so-called quasi-Boussinesq model, we consider
that density perturbations are solely due to temperature perturbations. In a
so-called quasi-anelastic liquid approximation, we consider that entropy
perturbations are solely due to temperature perturbations. In addition to the
numerical Chebyshev-based stability analysis, an analytical approximation is
obtained when temperature fluctuations are written as a combination of only two
modes. This analytical expression allows us to show that the superadiabatic
critical Rayleigh number quadratic departure in a and D from 27pi^4/4 involves
the expansion of density up to the degree three in terms of pressure and
temperature.Comment: 42 pages, 30 figures, 4 table
Measures and the Law of the Iterated Logarithm
Let m be a unidimensional measure with dimension d. A natural question is to
ask if the measure m is comparable with the Hausdorff measure (or the packing
measure) in dimension d. We give an answer (which is in general negative) to
this question in several situations (self-similar measures, quasi-Bernoulli
measures). More precisely we obtain fine comparisons between the mesure m and
generalized Hausdorff type (or packing type) measures. The Law of the Iterated
Logarithm or estimations of the L^q-spectrum in a neighborhood of q=1 are the
tools to obtain such results.Comment: 18 page
Second Order Topological Superconductivity in -Junction Rashba Layers
We consider a Josephson junction bilayer consisting of two tunnel-coupled
two-dimensional electron gas layers with Rashba spin-orbit interaction,
proximitized by a top and bottom -wave superconductor with phase difference
close to . We show that, in the presence of a finite weak in-plane
Zeeman field, the bilayer can be driven into a second order topological
superconducting phase, hosting two Majorana corner states (MCSs). If
, in a rectangular geometry, these zero-energy bound states are
located at two opposite corners determined by the direction of the Zeeman
field. If the phase difference deviates from by a critical value,
one of the two MCSs gets relocated to an adjacent corner. As the phase
difference increases further, the system becomes trivially gapped. The
obtained MCSs are robust against static and magnetic disorder. We propose two
setups that could realize such a model: one is based on controlling by
magnetic flux, the other involves an additional layer of randomly-oriented
magnetic impurities responsible for the phase shift of in the
proximity-induced superconducting pairing
John R. Searle, Liberté et neurobiologie. Réflexions sur le libre arbitre, le langage et le pouvoir politique. Paris, Grasset (coll. « Nouveau collège de philosophie »), 2004, 110 p.
Raison pratique et information asymétrique : Pour une éthique de la communication dans un monde risquophobe
Dans leur tentative de justifier moralement une « bonne » décision, les grandes théories de l’éthique normative ignorent des paramètres incontournables de la prise de décision. Or une classe importante de jeux non-coopératifs étudie plus spécialement les effets de ces paramètres sur la prise de décision des agents. Il s’agit des jeux à information asymétrique avec modèle agent-principal. Cet article se propose donc, dans la première partie, de voir comment opère la rationalité de l’agent quand on intègre ces paramètres. La deuxième partie soulignera les conséquences qui émanent de cette conception « élargie » de la rationalité sur le plan éthique et politique
- …